WO2008096382A1 - A device for separating solids from waste waters - Google Patents

A device for separating solids from waste waters Download PDF

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Publication number
WO2008096382A1
WO2008096382A1 PCT/IT2007/000085 IT2007000085W WO2008096382A1 WO 2008096382 A1 WO2008096382 A1 WO 2008096382A1 IT 2007000085 W IT2007000085 W IT 2007000085W WO 2008096382 A1 WO2008096382 A1 WO 2008096382A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
zone
solid parts
outlet
screw conveyor
Prior art date
Application number
PCT/IT2007/000085
Other languages
French (fr)
Inventor
Vainer Marchesini
Original Assignee
Wam S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wam S.P.A. filed Critical Wam S.P.A.
Priority to PCT/IT2007/000085 priority Critical patent/WO2008096382A1/en
Publication of WO2008096382A1 publication Critical patent/WO2008096382A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/445—Bar screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/908—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding provoking a tangential stream

Definitions

  • the invention relates to a device for separating solids from waste waters.
  • the invention is particularly applicable when solid parts transported by a flow of water are to be separated therefrom; in general, water thus rid of the solid parts is thereafter usually but not necessarily sent on to undergo a purification stage.
  • the prior art has for some time included devices in which a flow of fluid, generally water containing solid parts, enters through a variously-conformed inlet from a channel or inlet conduit; these devices are provided with a transport organ, generally an Archimedes screw, which rotates internally of a screen in order to transport the solid parts towards an outlet, also variously- conformed, while the liquid part passes through the openings in the screen.
  • a transport organ generally an Archimedes screw
  • the water thus rid of the solids passes through the screen and is discharged downstream of the device, which is predisposed to intercept the whole fluid flow, while the solids are transported in an upwards direction by the device before being discharged.
  • the level of fluid upstream of the device is higher by a small amount than the level downstream of the device; this in general offers up no problems, as the device, and in particular the diameter of the screen and its overall passage opening, is calculated to allow the normally expected liquid flow rate to pass. It can happen, however, for example in the case of a strong and unforeseen increase in the flow rate upstream of the device, that the device is not able to allow the whole flow to pass, possible leading to flooding upstream of the device.
  • the main aim of the present invention is to obviate the above-mentioned drawbacks, by providing a device which, without increasing the size of the screen and also without increasing the size of the screen's openings to change the dimensions of the solids which can cross it, is able to ensure a correct flow-through of higher fluid flow-rates with respect to what the device is rated for.
  • An advantage of the invention is that it guarantees a correct flow-through of the fluid even where there is a partial obstruction in the screen openings.
  • a further advantage of the invention is that it improves separation of the solids from the fluid flow.
  • Figure 1 is a schematic side view of the invention in vertical elevation, with some parts removed better to evidence others;
  • Figure 2 is a perspective view, with some parts removed better to evidence others, of a detail of the device of the invention
  • Figure 3 is a schematic view from above of the zone of the screens of the device, inserted between an inlet for the water to be filtered and an outlet zone of the water freed of the solid parts.
  • 1 denotes in its entirety a device which is used each time it is necessary to separate a solid part from a liquid part in waste waters, .and more in general from a fluid flow.
  • the device can usefully be applied, for example, in waste water purification plants or urban, industrial or animal waste fluid purification plants, and the like.
  • the device 1 comprises a first screen 2 internally of which, through an inlet 3, all the discharge water flows, from which the solid parts are to be separated; normally the water reaches the device via a channel or inlet conduit.
  • the liquid once separated from the solid parts, exits the screen and flows towards an outlet and collection zone 4 which is downstream of the screen 2.
  • Both the inlet 3 of the water to be purified and the. collection zone 4 of the liquid after removal of the solid parts can be variously shaped.
  • the inlet 3 is represented by a flanged tube, which opens into a small well connected to the free zone of the screen 2 through which the water to be separated enters the screen 2; a tube bringing the water to be separated is usually connected to the flanged tube.
  • This type of inlet could however be replaced, for example by a conveyor channel.
  • the collection zone, too which has the function of collecting the water after separation from the solid bodies exiting the screen 2, can be conformed in any ⁇ way which enables the said function to be performed.
  • the device further comprises a screw conveyor, which is coaxially arranged to the screen 2 and which is set in rotation internally of the screen 2 by a motor, of known type and schematically denoted by 10 in the figures.
  • the screw conveyor collects the solid parts from the discharge water and, thanks to the motion thereof, transports the solid parts towards an outlet 4a for the solid parts.
  • the outlet 4a of the solid parts is at a higher level than the screen 2 outlet; for this reason the screw conveyor is usually arranged in a vertical position, or is inclined upwards and the outlet of the solid parts, as well as the motor, is arranged at the opposite end of the conveyor to the screen 2.
  • the screen 2 is part of the casing of the screw conveyor; preferably, with the aim of increasing the passage space through the screen 2 and of limiting to a minimum the diameter of the screw, the part of the screw conveyor casing corresponding to the position of the screen 2, and also the part of the screw helix which rotates internally of the screen 2, have a greater diameter than the casing and the helix of the remaining part of the screw conveyor; the screen 2 is connected to the remaining part of the casing by a truncoconical connecting zone, and likewise the helix exhibits a connecting zone in which the helix develops truncoconically.
  • the screw conveyor comprises a helix 5 which develops on a central shaft 6 which is coaxial to the helix and is fixed with respect thereto; in other words, the screw is equipped with a helix which has an empty central part, and revolves about a shaft arranged in the empty central part.
  • the shaft 6 is conformed as a second screen 6a affording internally thereof an internal zone 7.
  • the second screen 6a has a larger diameter than the remaining part of the shaft 6; in this case too the second screen 6a is connected to the remaining part of the shaft by a truncoconical connecting zone.
  • the water to be purified entering the first screen 2, and being freed of the solid parts by the action of the first screen 2 can then exit from the openings in the first screen 2 and enter both the collection zone 4 of the purified waters and the free zone 7 internally of the second screen 6a.
  • An outlet conduit 8 is provided, which, without passing through the first screen 2 and the second screen 6a, connects the internal zone 7 of the second screen 6a with the outlet zone 4.
  • the conduit 8 is provided with two open ends; a first end of the conduit 8 opens into the bottom of the internal zone 7 of the second screen 6a, while the second end of the conduit 8 opens into the outlet zone 4; preferably the ends are at a same level.
  • the water in the free zone 7 of the second screen 6a can be discharged into the collection zone 4 for the purified water.
  • the lateral walls of the first screen 2 and the second screen 6a which are cylindrical, are constituted by parallel rods, arranged along the generatrices of the screens 2 and 6a, which define the external walls of the screens 2 and 6a; the rods have a triangular section with a vertex facing towards the outside of the first screen 2 and towards the inside of the second screen 6a.
  • This type of construction known as a Johnson filter, enables having the outlet openings of the screens disposed with a growing section in the flow direction of the fluid, thus reducing clogging in the outlet openings.
  • the screens can however be conformed in other known ways, for example they can be constituted by a wall, with support surface functions, in which holes are afforded which represent the passage openings.
  • a conveyor 3 a is provided in the inlet 3 for the discharge waters to be purified, which is conformed and arranged in such a way as to introduce, into the device and in particular into the first screen 2, the discharge water to be purified in a substantially tangential direction to the lateral wall of the second screen 6a and therefore to the first screen 2; in this way the distribution of the solid parts on the helix and the transport thereof towards the outlet 4a is facilitated; also, a frontal impact of the discharge water to be purified with the walls of the screens is prevented, with a consequent reduction in the possibility of clogging of some of the openings of the screens themselves.
  • a conveyor of the described shape can advantageously be used also in known- type devices, i.e. devices provided with only a first screen, where the same advantages can be thus enjoyed, i.e. a better distribution of the solid parts on the screw and less clogging of the single screen present.
  • This type of embodiment is not illustrated herein but can easily be gleaned from the accompanying figures of the drawings.
  • the discharge water to be purified is introduced, through the inlet 3, internally of the first screen 2.
  • the solid parts are transported towards the outlet 4a by the helix 5 which is in rotation about the shaft 6; as previously mentioned, the tangential inlet of the waters facilitates this function.
  • the purified water exits towards the collection zone 4, through the openings of the first screen 2, and enters the free zone 7 through the openings of the second screen 6a.
  • the fluid level upstream of the device is practically the same as the fluid level downstream thereof, as the load losses are of very modest entity; in this case the fluid flow rate exiting from the free zone 7 internal of the second screen 6a through the conduit 8 is in this case of very modest entity, in reality practically zero.
  • the flow rate of the device can be considerably increased (according to the diameter of the screen 6a, up to 70-80% more, with respect to known device devices provided with only the first screen).
  • smaller devices can be used, and therefore more economical and more versatile as they can be used in smaller-size plants.
  • the need to proceed to maintenance and cleaning operations of the device is considerably reduced, with obvious savings in the running costs of the device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

The invention relates to a device for separating solids from waste waters. The device comprises a first screen (2) internally of which discharge water is conveyed, an outlet zone (4) for the water once the solid parts have been removed; a screw conveyor, coaxial of the screen (2) and rotating internally of the screen (2), which transports the solid parts towards an outlet (4a); the screw conveyor comprises a helix (5) developing on a central axis (6) which is coaxial with the helix and fixed with respect thereto; at a zone comprising the first screen (2) the shaft (6) is conformed as a second screen (6a) which closes around an internal zone (7) connected, through an outlet conduit (8) which does not pass through the screens (2) and (6a), to the outlet zone (4). The device further comprises a conveyor (3a) which introduces the discharge water into the device in a tangential direction to a lateral wall of the second screen (6a).

Description

Description
A Device for Separating Solids from Waste Waters.
Technical Field
The invention relates to a device for separating solids from waste waters. The invention is particularly applicable when solid parts transported by a flow of water are to be separated therefrom; in general, water thus rid of the solid parts is thereafter usually but not necessarily sent on to undergo a purification stage.
Background Art
The prior art has for some time included devices in which a flow of fluid, generally water containing solid parts, enters through a variously-conformed inlet from a channel or inlet conduit; these devices are provided with a transport organ, generally an Archimedes screw, which rotates internally of a screen in order to transport the solid parts towards an outlet, also variously- conformed, while the liquid part passes through the openings in the screen. The water thus rid of the solids passes through the screen and is discharged downstream of the device, which is predisposed to intercept the whole fluid flow, while the solids are transported in an upwards direction by the device before being discharged. These devices do not effect a filtering of the fluid but are used to extract from the fluid the large solid bodies such as branches, leaves, grass, paper, cloths, agglomerated materials of various nature, and so on; the dimensions of the solids extracted obviously depend on the dimensions of the screen perforations. The following description concerns filtered water in outlet from the screen, and by the term "filtered", reference is made to water with the solid parts removed therefrom.
As the presence of the device constitutes an obstacle to the flow of fluid, it determines a loss of head, and it is therefore logical that the level of fluid upstream of the device is higher by a small amount than the level downstream of the device; this in general offers up no problems, as the device, and in particular the diameter of the screen and its overall passage opening, is calculated to allow the normally expected liquid flow rate to pass. It can happen, however, for example in the case of a strong and unforeseen increase in the flow rate upstream of the device, that the device is not able to allow the whole flow to pass, possible leading to flooding upstream of the device.
The main aim of the present invention is to obviate the above-mentioned drawbacks, by providing a device which, without increasing the size of the screen and also without increasing the size of the screen's openings to change the dimensions of the solids which can cross it, is able to ensure a correct flow-through of higher fluid flow-rates with respect to what the device is rated for.
An advantage of the invention is that it guarantees a correct flow-through of the fluid even where there is a partial obstruction in the screen openings.
A further advantage of the invention is that it improves separation of the solids from the fluid flow.
These aims and advantages and more besides are all attained by the invention as it is characterised in the accompanying claims.
Disclosure of Invention
Further characteristics and advantages will better emerge from the detailed description that follows, of a preferred but not exclusive embodiment of the invention, illustrated purely by way of non-limiting example in the enclosed figures of the drawings, in which:
Figure 1 is a schematic side view of the invention in vertical elevation, with some parts removed better to evidence others;
Figure 2 is a perspective view, with some parts removed better to evidence others, of a detail of the device of the invention;
Figure 3 is a schematic view from above of the zone of the screens of the device, inserted between an inlet for the water to be filtered and an outlet zone of the water freed of the solid parts.
With reference to the figures of the drawings, 1 denotes in its entirety a device which is used each time it is necessary to separate a solid part from a liquid part in waste waters, .and more in general from a fluid flow. The device can usefully be applied, for example, in waste water purification plants or urban, industrial or animal waste fluid purification plants, and the like.
The device 1 comprises a first screen 2 internally of which, through an inlet 3, all the discharge water flows, from which the solid parts are to be separated; normally the water reaches the device via a channel or inlet conduit. The liquid, once separated from the solid parts, exits the screen and flows towards an outlet and collection zone 4 which is downstream of the screen 2.
Both the inlet 3 of the water to be purified and the. collection zone 4 of the liquid after removal of the solid parts can be variously shaped. In the embodiment of the figures the inlet 3 is represented by a flanged tube, which opens into a small well connected to the free zone of the screen 2 through which the water to be separated enters the screen 2; a tube bringing the water to be separated is usually connected to the flanged tube. This type of inlet could however be replaced, for example by a conveyor channel. The collection zone, too, which has the function of collecting the water after separation from the solid bodies exiting the screen 2, can be conformed in any¬ way which enables the said function to be performed.
The device further comprises a screw conveyor, which is coaxially arranged to the screen 2 and which is set in rotation internally of the screen 2 by a motor, of known type and schematically denoted by 10 in the figures. The screw conveyor collects the solid parts from the discharge water and, thanks to the motion thereof, transports the solid parts towards an outlet 4a for the solid parts. Generally the outlet 4a of the solid parts is at a higher level than the screen 2 outlet; for this reason the screw conveyor is usually arranged in a vertical position, or is inclined upwards and the outlet of the solid parts, as well as the motor, is arranged at the opposite end of the conveyor to the screen 2. Generally the screen 2 is part of the casing of the screw conveyor; preferably, with the aim of increasing the passage space through the screen 2 and of limiting to a minimum the diameter of the screw, the part of the screw conveyor casing corresponding to the position of the screen 2, and also the part of the screw helix which rotates internally of the screen 2, have a greater diameter than the casing and the helix of the remaining part of the screw conveyor; the screen 2 is connected to the remaining part of the casing by a truncoconical connecting zone, and likewise the helix exhibits a connecting zone in which the helix develops truncoconically.
The description up to now relates to common aspects of both the device of the present invention and of the known devices.
In the device of the invention, the screw conveyor comprises a helix 5 which develops on a central shaft 6 which is coaxial to the helix and is fixed with respect thereto; in other words, the screw is equipped with a helix which has an empty central part, and revolves about a shaft arranged in the empty central part. At the zone comprising the first screen 2, the shaft 6 is conformed as a second screen 6a affording internally thereof an internal zone 7. The second screen 6a has a larger diameter than the remaining part of the shaft 6; in this case too the second screen 6a is connected to the remaining part of the shaft by a truncoconical connecting zone.
The water to be purified entering the first screen 2, and being freed of the solid parts by the action of the first screen 2, can then exit from the openings in the first screen 2 and enter both the collection zone 4 of the purified waters and the free zone 7 internally of the second screen 6a.
An outlet conduit 8 is provided, which, without passing through the first screen 2 and the second screen 6a, connects the internal zone 7 of the second screen 6a with the outlet zone 4. The conduit 8 is provided with two open ends; a first end of the conduit 8 opens into the bottom of the internal zone 7 of the second screen 6a, while the second end of the conduit 8 opens into the outlet zone 4; preferably the ends are at a same level.
By means of this conduit, in a way which will be described herein below, the water in the free zone 7 of the second screen 6a can be discharged into the collection zone 4 for the purified water.
Preferably the lateral walls of the first screen 2 and the second screen 6a, which are cylindrical, are constituted by parallel rods, arranged along the generatrices of the screens 2 and 6a, which define the external walls of the screens 2 and 6a; the rods have a triangular section with a vertex facing towards the outside of the first screen 2 and towards the inside of the second screen 6a. This type of construction, known as a Johnson filter, enables having the outlet openings of the screens disposed with a growing section in the flow direction of the fluid, thus reducing clogging in the outlet openings. The screens can however be conformed in other known ways, for example they can be constituted by a wall, with support surface functions, in which holes are afforded which represent the passage openings. This type of realisation can be advantageous, in particular for the second screen 6a. A conveyor 3 a is provided in the inlet 3 for the discharge waters to be purified, which is conformed and arranged in such a way as to introduce, into the device and in particular into the first screen 2, the discharge water to be purified in a substantially tangential direction to the lateral wall of the second screen 6a and therefore to the first screen 2; in this way the distribution of the solid parts on the helix and the transport thereof towards the outlet 4a is facilitated; also, a frontal impact of the discharge water to be purified with the walls of the screens is prevented, with a consequent reduction in the possibility of clogging of some of the openings of the screens themselves. A conveyor of the described shape can advantageously be used also in known- type devices, i.e. devices provided with only a first screen, where the same advantages can be thus enjoyed, i.e. a better distribution of the solid parts on the screw and less clogging of the single screen present. This type of embodiment is not illustrated herein but can easily be gleaned from the accompanying figures of the drawings.
During operation of the device, the discharge water to be purified is introduced, through the inlet 3, internally of the first screen 2. The solid parts are transported towards the outlet 4a by the helix 5 which is in rotation about the shaft 6; as previously mentioned, the tangential inlet of the waters facilitates this function. The purified water exits towards the collection zone 4, through the openings of the first screen 2, and enters the free zone 7 through the openings of the second screen 6a.
During normal operation of the device, i.e. when the water flow in inlet is lower than the maximum possible in outlet from the first screen 2, or when the openings of the first screen 2 are completely free, the fluid level upstream of the device is practically the same as the fluid level downstream thereof, as the load losses are of very modest entity; in this case the fluid flow rate exiting from the free zone 7 internal of the second screen 6a through the conduit 8 is in this case of very modest entity, in reality practically zero. In a case, however, where the fluid flow rate in inlet to the device is higher with respect to the rated flow, or where there is a partial obstruction of the openings of the first screen 2, the fluid level upstream of the device tends to increase and might cause flooding in the channel or the inlet conduit, as can happen in known-type devices. In the present device, however, thanks to the presence of the second screen 6a and the conduit 8, by the principle of communicating channels the water flows towards the outlet zone 4, including through the conduit 8 itself.
With the device of the invention, without increasing the size of the first screen 2 the flow rate of the device can be considerably increased (according to the diameter of the screen 6a, up to 70-80% more, with respect to known device devices provided with only the first screen). Obviously, considering a same flow-rate, smaller devices can be used, and therefore more economical and more versatile as they can be used in smaller-size plants. Further, given the fact that the device can guarantee a good flow rate even in the presence of partial obstructions in the passage openings of the first screen 2, the need to proceed to maintenance and cleaning operations of the device is considerably reduced, with obvious savings in the running costs of the device.

Claims

Claims.
1). A device for separating solids from waste waters, comprising: a first screen (2) internally of which all discharge water from which solid parts are to be removed is conveyed through an inlet (3); an outlet zone (4), located downstream of the screen (2), for the water once the solid parts have been removed; a screw conveyor, internal and coaxial of the screen and set in rotation by a motor, which screw conveyor transports the solid parts towards an outlet (4a) of the solid parts; wherein the screw conveyor comprises a helix (5) which develops on a central axis (6) which is coaxial with the helix (5) and fixed with respect thereto; at a zone comprising the first screen (2) the shaft (6) is conformed as a second screen (6a) which closes around an internal zone (7); the device comprising an outlet conduit (8) which, without passing through the first screen (2) and the second screen (6a), connects the internal zone (7) of the second screen (6a) with the outlet zone (4). 2). The device of claim 1, wherein the conduit (8) exhibits two open ends, a first end of which opens on a bottom of the internal zone 7 of the second screen (6), while a second end opens into the outlet zone (4); the ends are located at a same level.
3). The device of claim 1, wherein the inlet (3) comprises a conveyor (3a) conformed and arranged in such a way as to introduce the discharge water into the device in a direction which is substantially tangential to a lateral wall of the second screen (6a). 4). The device of claim 1, wherein the lateral walls of the first screen (2) and the second screen (6a) are realised by a plurality of parallel rods having a triangular section with a vertex facing towards an outside in the first screen (2) and towards an inside in the second screen (6a).
5). The device of claim 1, wherein the lateral wall of the second screen (6a) comprises a support surface in which holes are afforded which represent passage holes of the second screen (6a).
6). A device for separating solids from waste waters, comprising: a first screen (2) internally of which all discharge water from which solid parts are to be removed is conveyed through an inlet (3); an outlet zone (4), located downstream of the screen (2), for the water once the solid parts have been removed; a screw conveyor, internal and coaxial of the screen and set in rotation by a motor, which screw conveyor transports the solid parts towards an outlet (4a) of the solid parts; wherein the intlet (3) comprises a conveyor (3a) conformed and arranged in such a way as to introduce the waste water into the device in a substantially tangential direction to a lateral wall of the first screen (2).
PCT/IT2007/000085 2007-02-08 2007-02-08 A device for separating solids from waste waters WO2008096382A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000085 WO2008096382A1 (en) 2007-02-08 2007-02-08 A device for separating solids from waste waters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000085 WO2008096382A1 (en) 2007-02-08 2007-02-08 A device for separating solids from waste waters

Publications (1)

Publication Number Publication Date
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Country Status (1)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1167795B (en) * 1961-06-13 1964-04-16 Heinrich Grossjohann Dipl Ing Liquid filter
US20050189287A1 (en) * 2004-02-26 2005-09-01 Liung Feng Industrial Co., Ltd. Slurry expressing and liquid displacing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1167795B (en) * 1961-06-13 1964-04-16 Heinrich Grossjohann Dipl Ing Liquid filter
US20050189287A1 (en) * 2004-02-26 2005-09-01 Liung Feng Industrial Co., Ltd. Slurry expressing and liquid displacing device

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